I doubt you could call this silly little maneuver outflanking anything or anyone. Belgium is perfectly entitled to do whatever it likes to commemorate something that occurred before it was even a country at all--that didn't happen until 1830, after all, when it got its independence with help from the British and French and then its little king from the tiny Stud Farm of Europe.
Those who look at Waterloo on a larger scale, and from differing perspectives, truly don't care about the coins and stamps and beer mugs and tea cups and T-shirts proliferating about as quickly as books on the battle in all its permutations. While my interests--and sentiments--have always been on the French side of things, I want a coin or two, not to mention the stamps, and have a request in to friends going to the battlefield for the T-shirt. I do draw the line at most of the books, for whom many trees were needlessly sacrificed.